The Hebrew alphabet is not simply a collection of abstract linguistic elements, like the English alphabet is. All Hebrew letters have names and identities, and in post-Biblical times were even rendered numerical value.
It contains secrets that were preserved by the initiated. They contain the precise plan of the principles of creation.
Each letter (or auth) is a crystallization of one of the aspects of manifestation of the divine word. Each letter corresponds to a number which places it in a numerical hierarchy, a hieroglyph as a visual representation
in form, and a symbol that makes it connect to other letters.
Aleph as first letter is attributed to Kether, the origin of the Tree of Life.
As a symbol Aleph represents unity, origin, power, continuity and stability.